Model by IP UNKNOWN FAILURE Error.
When you model a device by IP, the following error pops up:
Error creating the model in landscape <>:
Often the cause of this error is because the IP address being used is in the AutoDiscovery IP Exclusion List. To view the list, go to the Information tab for the VNM model. Then select AutoDiscovery Control -> Modeling and Protocol Options. The IP Exclusion List is on the right.